Hello,
Thank you for getting back to us.
No, it is not possible to set the quota limits for the products service. The API quota limit will be different for all methods available in the Content API. For more information, you may refer to this
link for Content API quota limits.
We cannot make any request to increase the quota limit for products, accounts services where the quota limit for these services will be increased automatically. You will get the maximum number of API calls by increasing the number of products. It will be flexible with the number of the products in your Merchant Center account. The automatic quota system will increase your quota so that you consistently have the ability to update all your product information.